November 2006

Binomial coefficients and Nasir al-Din al-Tusi

  A historical note is given about the scientist Nasir al-Din al-Tusi legitimating the introduction of a new concept related to binomial coefficients. Al-Tusi binomial coefficients and binomial formulas are introduced and studied.   Key words: Binomial coefficients, binomial theorem, history of Mathematics.

Author(s): Othman Echi

November 2006

Agricultural products and by-products as a low cost adsorbent for heavy metal removal from water and wastewater: A review

  The use of agricultural products and by-products has been widely investigated as a replacement for current costly methods of removing heavy metals from water and wastewater. Some of the agricultural materials can be effectively used as a low-cost sorbent. Modification of agricultural by-product could enhance their natural capacity and add value to the by-product. In this review, an extensive list of sorbent...

Author(s): Upendra Kumar

November 2006

Spices, fungi mycelial development and ochratoxin A production

  The effect of ten powdered spice plants was evaluated (at 1, 2, 3 and 4% concentration) to observe the micelial growth and esporulation of  Penicillium roqueforti Thompson andRhizopus stolonifer (Ehrenberg: Fries) Vuillemin. The spices were added to the culture media PDA and CYA20S. Clove completely inhibited the mycelial growth of the tested fungi. The other spices; cinnamon,...

Author(s): Marcelo Cláudio Pereira, Sara Maria Chalfoun, Carlos José Pimenta, Caroline Lima Angélico and William Pereira Maciel

November 2006

A new algorithm for image segmentation by using iteratively the mean shift filtering

  Image segmentation plays an important role in many systems of computer vision. The good performance of recognition algorithms depend on the quality of segmented image. According to the opinion of many authors the segmentation concludes when it satisfies the observer’s objectives, the more effective methods being the iterative. However, a problem of these algorithms is the stopping criterion.  In...

Author(s): Roberto Rodríguez and Ana G. Suarez

November 2006

Antibacterial activity of aqueous and ethanol extracts of the stem bark of Alstonia boonei and Morinda lucida

  The water and ethanol extracts of the stem bark of two Nigerian medicinal plants, Alstonia boonei and Morinda lucida, used traditionally in treating several ailments were tested on clinical isolates of two Gram-positive and five Gram-negative bacteria. Ethanol extract of A.boonei was not active against any of the bacterial tested while the aqueous stem barks extracts of A....

Author(s): Patience O. Adomi

November 2006

The Impact of Internet Usage: A case study of Delta State (Nigeria) tertiary institutions

  The Internet is one of the greatest recent advancement in the world of information technology and has become a useful instrument that has fostered the process of making the world a global village. However, despite the added benefits of the Internet to learning, teaching and research, there is no provision of effective Internet services in most of the tertiary institutions in Delta State. The objective of this...

Author(s): R.J. Ureigho, G.U. Oroke and G.O. Ekruyota